Charles m



No. 6I4,782. Patented Nov. 22, |898.

y C. M. BARNARD.

BOX FUR NAIL DRIVING MACHINES.

(Apphcatxon led Se t 7 189 (No Modeh) NKNNM/ UNITED STATES PATENT Fries.

CHARLES M. BARNARD, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE-FOURTH TO HENRY GAUS, OF SAME PLACE. l

BOX FOR NAIL-DRIVING MACHINES.

SPECIFICATION forming part of Letters Patent No. 614,782, dated November 22, 1898.

Application tiled September '7, 1897. Serial No. 650,835. (No model.)

.To all wir/0m. it may concern.-

Be it known that I, CHARLES M. BARNARD, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented a certain new anduseful Improvement in Boxes for Nail-Driving Machines, of which the following is a full, clear, and exact description, reference bein g had to the accompanying drawings, forming a part of this specification.

It is the object of my invention to provide a box for nail-driving machines in which the nail is held iirmly ina fixed position between jaws at a pressure which remains uniform. It is adapted to be used upon the ordinary forms of nail-driving machines, to which several of the boxes are attached in order that a series of nails may be driven at a time.

Referring to the drawings forming a part of this specification, Figure I illustrates an interior side view of one-half of the box, showing the jaws closed. Fig. II is a view similar to that shown in Fig. I, excepting that the jaws which hold the nail are forced open by the insertion of the plunger. Fig. III is a detail view taken along the line III III of Fig. V. Fig. lV is a detail view taken along the line IV IV of Fig. V. Fig. V is an enlarged side view of a portion of the outside of the box. Fig. VI is a vertical section of one of the jaws, taken along the line VI VI of Fig. VII. Fig. VII is a vertical view of the front of one of the jaws.

l and l are the sides of the box.

2 is one of the screws by means of which the two sides l and l' are held together.

3 is an opening bymeans of which a series of boxes are placed on a bar placed therethrough, held in position by means of a setscrew inserted in the threaded hole 4.

5 is the feed-passage through which the nails are introduced.

G is a plunger which drives the nails by meansof power applied to the top thereof.

7 and 7' are the jaws, provided with open inner faces adapted to close against each other in line with the plunger 6. The open inner jaw-faces form a passage-way that is funnel-shaped at the top and straight for a distance at the bottom. The funnel-shaped passage-way in the jaws is square vin crosssection, as shown in Figs. III and IV.

The sides l and l are provided with oblique slots 8 and S,in which pins 9 and 9', secured to the jaws. 7 and 7, are adapted to ride. These pins govern the upper portion of the jaws. Pins l() and l0', secured to the sides l and 1 at the lower portion of the jaws, guide the said lower portion by means of the projections 1I and 11,', having inclined edges adapted to ride against said pins as the nail is driven through the jaws. 12 and12 are guiding'cross-bars fitting in recesses in the sides of the jaws 7 and 7 and regulate the movement of the jaws to cause them to travel together and to prevent either jaw from moving faster than the other jaw.

13 and 13are stout coil-springs, one end of each of which rests on an inclined shoulder in inclined receiving-chambers of the box and the other ends of which bear against inclined shoulders of the jaws, being held in place by the inclined pins 14 and 14:. These springs are placed at an angle of approximately forty-ve degrees, so that their pressure is exerted against the jaws at such angle instead of directly against them, as heretofore has been the case. If there is atendency for one spring to' exert more force than the other, it is equalized by the ability of the jaws to ride against the pins, and yet one jaw cannot get beyond the other by reason of the guiding cross-bars 12 and l2.

The operation of the device is as follows: The end of a nail dropped in through the feed-passage 5 rests on the lower portion of the opening between the jaws 7 and 7. rIhe plunger 6 is then driven against the head thereof, which action forces the jaws open. The pressure of the springs 13 and 13 keeps the nail rmly clamped and prevents the same bending. These springs being placed obliquely and the guide-pins 9, 9', 10, and l0' permitting the opening of the jaws allows a nail of any size being used in the box. The guiding cross-bars 12 and 12', moreover, prevent one jaw riding faster than the other. Hence an equal pressure and uniform position of the nail is maintained. The advantage in having the opening between the jaws approximately square lies in the fact that the head of an inserted nail will adjust itself to the taper and the square sides will then bind the same iirlnly. This is not accomplished by a circular opening.

I claim as my inventionl. Abox for nail-driving machines comprising spring-receiving chambers, a pair of jaws having inclined shoulders, and located in the box, and inclined springs located in the chambers and bearing against the inclined shoulders of the jaws to keep the latter' normally closed; substantially as described.

2. A box for nail-driving machines comprising spring-receiving chambers, and guiding cross -bars, a pair of jaws having inclined shoulders, and located in the box, and inclined springs located in the chambers and bearing against the inclined shoulders of the jaws to keep the latter normally closed; substantially as described.

3. A box for nail-driving machines comprising sides having inclined slots, spring-reeeiving chambers, and guiding cross-bars, a pair of jaws havinginclined shoulders, projections having inclined faces, and a tapering square opening between them, lower pins secured td the box and adapted to act as guides for the projections, upper pins on the jaws adapted to slide in the inclined slots, and inclined springs located in the chambers, and bearing against the inclined shoulders of the jaws to keep the latter normally closed; substantially as described.

4. A box for nail-driving machines comprising sides having inclined slots, a feed-passage, spring-receiving chambers, and guiding crossbars, a pair of jaws having inclined shoulders and projections having inclined faces, the pins secured to the jaws and working in the slots, the pins on which the inclined faces bear, the inclined pins projecting from the inclined shoulders, and the inclined springs located in the chambers surrounding the inclined pins and bearing against the inclined shoulders of the jaws to keep the latter normally closed; Ysubstantially as described.

E. S. KNIGHT, STANLEY STONER. 

